It’s a sad day in the land of OS X, the Flashback malware has infected an estimated 600,000 Macs.

Flashback began life last year as a trojan and has morphed into a drive-by download taking advantage of a vulnerability in Java that Apple did not patch until last week, despite Oracle having released patches for other systems back in February.

If you are afraid that your Mac might be infected try running the FlashbackChecker available from Github.